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31. 发明专利

JPH0842327A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH0842327A
公开(公告)日：1996-02-13
申请号：JP18141994
申请日：1994-08-02
申请人： TOYOTA MOTOR CORP
发明人： ASANUMA TAKAMITSU , IGUCHI SATORU , KATO KENJI , KIHARA TETSUO
IPC分类号： F02P5/15 , F01N3/08 , F01N3/24 , F02D41/14 , F02D43/00 , F02D45/00
摘要： PURPOSE:To suppress the variation of the output torque of an engine by providing an NOX absorbent in the exhaust passage of the engine and providing an output torque changing means for gradually changing the engine output torque by a predetermined amount. CONSTITUTION:A fuel injection valve 11 for injection fuel into an intake port 6 is attached to a branch pipe 9. An exhaust port 8 is connected to a casing 17 in which an NOX absorbent is housed through an exhaust manifold 15 and an exhaust pipe 16. An idle rotating speed control valve 20 is provided in a bypass passage 19. An output port 36 is connected to a spark plug 4, the fuel injection valve 11 and the idle rotating speed control valve 20 through corresponding drive circuits 38. Period during which an engine output torque is gradually changed, upon transition of a rich mixture to a lean mixture, is made longer than that, upon transition of the lean mixture to the rich mixture. In this way, the variation of the output torque can be suppressed.

32. 发明专利

JPH0814030A EXHAUST EMISSION CONTROL ELEMENT DETERIORATION DETECTOR FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH0814030A
公开(公告)日：1996-01-16
申请号：JP14944694
申请日：1994-06-30
申请人： TOYOTA MOTOR CORP
发明人： KIHARA TETSUO , KATO KENJI , ASANUMA TAKAMITSU , IGUCHI SATORU
IPC分类号： F02D45/00 , B01D53/94 , F01N3/08 , F01N3/18 , F01N3/20 , F01N3/24 , F01N11/00 , F02D41/02 , F02D41/14
摘要： PURPOSE:To accurately detect deterioration degree of NOx absorbent or three way catalyst. CONSTITUTION:An exhaust control element 18 composed of NOx absorbent and three way catalyst is arranged in an engine exhaust passage. O2 sensor 22 whose output current and voltage are proportional to air fuel rate is arranged in an exhaust pipe 21 in the lower stream of the exhaust control element 18. The air fuel rate of mixed gas is temporarily shifted from lean to rich or rich to lean so that deterioration degree of NOx absorbent or the three way catalyst is detected from the peak value of the output current or voltage of O2 sensor 22 during shifting this air fuel rate.

33. 发明专利

JPH07217474A EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH07217474A
公开(公告)日：1995-08-15
申请号：JP870694
申请日：1994-01-28
申请人： TOYOTA MOTOR CORP
发明人： KIHARA TETSUO , KATO KENJI , TANAKA TOSHIAKI , IGUCHI SATORU , TAKESHIMA SHINICHI , ASANUMA TAKAMITSU , NAKANISHI KIYOSHI
IPC分类号： F02D45/00 , B01D53/34 , B01D53/46 , B01D53/56 , F01N3/08 , F01N3/18 , F01N3/24 , F02D41/04 , F02D41/14 , F02D43/00 , F02P5/15
摘要： PURPOSE:To pertinently release NOx from an NOx absorbent. CONSTITUTION:An engine emission passage is internally provided with an NOx absorbent 18 capable of absorbing NOx, when the air-fuel ratio of incoming emission is lean, while releasing absorbed NOx when the ratio is at theoretical level or rich. Furthermore, the air-fuel ratio of the emission flowing into the absorbent 18 is temporarily made rich, when an SOx amount estimated as absorbed in the absorbent 18 exceeds an allowable level at a lean or theoretical fuel-air ratio and temperature representing the absorbent 18 is higher than the preset level. The absorbent 18 is thereby made to release SOx.

34. 发明专利

JPH07166851A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH07166851A
公开(公告)日：1995-06-27
申请号：JP1112794
申请日：1994-02-02
申请人： TOYOTA MOTOR CORP
发明人： KATO KENJI , KIHARA TETSUO , ASANUMA TAKAMITSU , IGUCHI SATORU , ARAKI YASUSHI , HIROTA SHINYA , OBATA KIYOSHI
IPC分类号： F01N3/08 , F01N3/18 , F01N3/20 , F01N3/24 , F01N3/28 , F02D41/04 , F02D41/14
摘要： PURPOSE:To efficiently purify exhaust by operating an NOx absorbent properly regenerated in accordance with change in its absorbing ability, preventing an exhaust nature from worsening due to decrease in the absorbing ability of the NOx absorbent, and also effectively applying the absorbing ability of the NOx absorbent. CONSTITUTION:A NOx sensor 20 is arranged in the downstream of an NOx absorbent 18 ion an exhaust passage 17 of an internal combustion engine, and based on detected concentration of an NOx component, when decided worsening NOx absorbing ability of the NOx absorbent 18, the NOx absorbent is regenerated.

35. 发明专利

JPH06346768A EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH06346768A
公开(公告)日：1994-12-20
申请号：JP13858693
申请日：1993-06-10
申请人： TOYOTA MOTOR CORP
发明人： TANAKA TOSHIAKI , TAKESHIMA SHINICHI , IGUCHI SATORU , NAKANISHI KIYOSHI , KATO KENJI
IPC分类号： F01N3/08 , F01N3/18 , F01N3/20 , F01N3/24 , F02D41/04 , F02D43/00
摘要： PURPOSE:To prevent SOX discharged from a SOX absorber from being absorbed into a NOX absorber. CONSTITUTION:An SOX absorber 16 and an NOX absorber 19 are arranged in an engine exhaust passage, and a bypass passage 21 is branched from between the SOX absorber 16 and the XOZX absorber 19. When lean mixture air is burnt, exhaust gas which flows-in from the SOX absorber 16 is forced to flow in the NOX absorber 19. When mixture air stays in its rich condition and SOX is discharged from the SOX absorber 16, a switching valve 24 is switched so as to lead exhaust gas which flows-out from the SOX absorber 16 into the bypass passage 21.

36. 发明专利

JPH06108834A EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH06108834A
公开(公告)日：1994-04-19
申请号：JP25830892
申请日：1992-09-28
申请人： TOYOTA MOTOR CORP
发明人： KATO KENJI
IPC分类号： F01N3/08 , F01N3/24 , F01N3/28
摘要： PURPOSE:To improve NOX purification rate by raising and lowering the temperature of an NOX adsorption/discharge catalyst forcibly and repeatedly in a range where the NOX adsorption/discharge catalyst indicates catalyst activating temperature for forcible generation of the process of raising the temperature of the NOX adsorption/ discharge catalyst. CONSTITUTION:Both main and auxiliary NOX adsorption/discharge catalysts 10, 12 are disposed at both main and auxiliary exhaust gas passages 6, 8 in the exhaust gas passage 4 of an internal combustion engine 2, and both opening/closing valves 14, 16 are disposed upstream of those catalysts. Both the opening/closing valves 14, 16 are interlocked with each other to open and close them alternately. Namely, driving the valves are controlled by an electronic control unit 20 through an actuator 18 respectively based on the detected signals of a throttle opening degree sensor 22. Both the opening/closing valves 14, 16 are controlled in a temperature range where both the catalysts 10, 12 indicate catalyst activation temperature respectively to raise and lower the temperature of both the catalysts 10, 12 forcibly and repeatedly. It is thus possible to forcibly generate process of raising the temperature of both the catalysts 10, 12, thus improving an NOX purification rate.

37. 发明专利

JPH04265415A EXHAUST PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH04265415A
公开(公告)日：1992-09-21
申请号：JP4566391
申请日：1991-02-20
申请人： TOYOTA MOTOR CORP
发明人： KATO KENJI
IPC分类号： F01N3/20 , F01N3/22 , F01N3/28
摘要： PURPOSE:To prevent deterioration of a lean NOX catalyst due to exposure in an oxidizing atmosphere. CONSTITUTION:The exhaust purifying device of an internal combustion engine is constituted out of a lean NOX catalyst 6 and a start catalyst 8 provided in the exhaust system 4 of the internal combustion engine 2, exhaust changeover valves 14a, 14b, secondary air supply devices 16, 18, an exhaust atmosphere judging means 114 to judge whether the atmosphere is rich or not in air-fuel ratio, and control means 118, 120 to change the exhaust changeover valves to the start catalyst 8 side and operate the secondary air supply devices at rich air-fuel ratio of the exhaust atmosphere. By supplying secondary air, rich exhaust can be scavenged from the lean NOX catalyst 6, and deterioration of the lean NOX catalyst 6 is controlled.

38. 发明专利

JPH04193345A CATALYST FOR PURIFICATION OF EXHAUST GAS 失效
公开(公告)号：JPH04193345A
公开(公告)日：1992-07-13
申请号：JP32263890
申请日：1990-11-28
申请人： TOYOTA MOTOR CORP
发明人： MURAKI HIDEAKI , INOUE TOKUTA , OISHI KIYOHIKO , KATO KENJI
IPC分类号： B01D53/94 , B01J23/56 , B01J23/63
摘要： PURPOSE:To obtain a catalyst enabling efficient removal of NOx at about 300 deg.C by supporting a noble metal on a carrier based on oxide or double oxide of at least one kind of metal selected among rare earth metals and group IVA metals of the periodic table. CONSTITUTION:At least one kind of noble metal is supported on a carrier which is formed by an oxide or double oxide of at least one kind of metal selected among rare earth metals and group IVA metals of the periodic table to form a catalyst for purification of exhaust gas. Otherwise, an oxide or double oxide of at least one kind of metal selected among rare earth metals and group IVA metals of the periodic table and at least one kind of noble metal are supported on alumina carrier to form a catalyst for purification of exhaust gas. Since the oxide or double oxide is used, NOx in exhaust gas from an automobile on the lean side can efficiently be removed. The noble metal is Pt, Pd or Rh, preferably Pt or Rh.

39. 发明专利

JPH03217640A EXHAUST GAS PURIFIER OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH03217640A
公开(公告)日：1991-09-25
申请号：JP1247690
申请日：1990-01-24
申请人： TOYOTA MOTOR CORP
发明人： KATO KENJI , MATSUSHITA SOICHI , INOUE TOKUTA
IPC分类号： F02D41/02 , B01D53/86 , B01D53/94 , F01N3/24 , F01N3/28 , F02D41/34
摘要： PURPOSE:To improve NOx purifying rate by changing fuel injecting timing so as to increase HC amount which flows into a lean NOx catalyzer while it is being judged that the HC amount is not sufficient for purifying NOx. CONSTITUTION:An electronic control device 36 reads output VHC from an HC sensor 8 installed in an exhaust system and at the upstream of a lean NOx catalyser 2. It judges whether VHC of present HC amount in the exhaust is sufficient for V0 of required HC amount of NOx for purifying NOx in the lean NOx catalyser 2 or not. When the HC amount is judged insufficient, BIT of the best fuel injecting start timing is delayed. Since injecting time is unchanged, a part of injected fuel does not enter the inside of a cylinder at its injection cycle, but enters the inside of the cylinder at the next injection cycle along a port wall in the form of liquid, which makes complete combustion difficult to increase HC amount in the exhaust. It is thus possible to increase HC amount only for a changing time of NOx purifying rate in the lean NOx catalyser 2.

40. 发明专利

JPS6469730A CONTROLLER FOR VARIABLE COMPRESSION RATIO TYPE INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPS6469730A
公开(公告)日：1989-03-15
申请号：JP22528387
申请日：1987-09-10
申请人： TOYOTA MOTOR CORP
发明人： KATO KENJI , NARUOKA TAKAO , IWASAKI EIJI
IPC分类号： F02D15/04 , F02D15/02 , F02D45/00
摘要： PURPOSE:To suppress the generation of knocking by determining the correction value of the base compression ratio or the correction value of the compression ratio switching operation condition which is previously determined according to the operation condition according to the frequency of generation of knocking and controlling the compression ratio according to the correction value. CONSTITUTION:In an internal combustion engine 1 equipped with a compression ratio varying mechanism 2 which varies the compression ratio by varying the relative position of a piston for a connecting rod, a knocking detecting means 3 for detecting the generation of knocking is installed. The detection signal of the detecting means 3 is inputted into a correction value setting means 4, and the correction value of the base compression ratio or the correction value of the compression ratio switching operation condition which is previously determined according to the operation condition is determined according to the frequency of generation of knocking, and the correction value is memory-held in a memory holding means 5. The compression ratio is controlled by correcting the base compression ratio or the compression ratio switching operation condition by a compression ratio control means 6 according to the determined correction value.

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